/// <inheritdoc />
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (disposing)
{
using (StreamOperationToken op = StartNewOperation(StreamOperation.Dispose))
{
BackgroundOperationSlot slot = op.WaitForBackgroundOperationSlot();
if (slot.Usability != StreamUsability.Broken)
{
FlushOrDiscardBufferAsync(slot).GetAwaiter().GetResult();
}
if (m_ownsFile)
{
m_file.Close();
}
if (slot.Usability == StreamUsability.Broken)
{
throw slot.ThrowExceptionForBrokenStream();
}
}
}
// TODO: Consider FailFast for the !disposing (finalizer) case.
internalBuffer.Dispose();
}
/// <summary>
/// <see cref="Stream.Flush"/>
/// </summary>
public override void Flush()
{
using (StreamOperationToken op = StartNewOperation(StreamOperation.Flush))
{
BackgroundOperationSlot slot = op.WaitForBackgroundOperationSlot();
if (slot.Usability == StreamUsability.Broken)
{
throw slot.ThrowExceptionForBrokenStream();
}
// TODO: Shouldn't drop the read buffer unless seeking to a new position.
FlushOrDiscardBufferAndResetPositionAsync(op, slot, m_position).GetAwaiter().GetResult();
}
}
/// <summary>
/// <see cref="Stream.Seek(long, SeekOrigin)"/>
/// </summary>
public override long Seek(long offset, SeekOrigin origin)
{
using (StreamOperationToken token = StartNewOperation(StreamOperation.Seek))
{
BackgroundOperationSlot slot = token.WaitForBackgroundOperationSlot();
if (slot.Usability == StreamUsability.Broken)
{
throw slot.ThrowExceptionForBrokenStream();
}
long offsetFromStart;
switch (origin)
{
case SeekOrigin.Begin:
Contract.Assume(offset >= 0, "Attempted to seek to a negative offset");
offsetFromStart = offset;
break;
case SeekOrigin.Current:
Contract.Assume(m_position >= offset, "Attempted to seek (relative to current) to a negative offset");
offsetFromStart = m_position + offset;
break;
case SeekOrigin.End:
throw new NotSupportedException("Seeking relative to stream end is not supported");
default:
throw Contract.AssertFailure("Unknwon SeekOrigin");
}
if (m_position != offsetFromStart)
{
FlushOrDiscardBufferAndResetPositionAsync(token, slot, offsetFromStart).GetAwaiter().GetResult();
}
return(offsetFromStart);
}
}
